Thomas Sinclair was born in 1843 in Scotland, the second son of George Dunbar Sinclair and Helen Graham. He attended Edinburgh University, the New College, and the Sorbonne, earning an M.A. along the way. Sinclair worked as a tutor before turning to journalism in 1874-thereafter he became a prolific writer of poetry, reviews, articles, travel, and criticism. In addition, he wrote one novel, Goddess Fortune (1884), about children switched at birth. He travelled widely, living for a time on the continent and in Algeria. He never married and was still living in 1907 in Bournemouth.